body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f7f7f7;
    color: #333;
}

header {
    background: #1b1b1b;
    padding: 15px 0;
    margin-bottom: 20px;
}

nav {
    max-width: 900px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: #fff;
    margin-left: 15px;
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

main {
    max-width: 900px;
    margin: auto;
    padding: 20px;
}

footer {
    margin-top: 40px;
    background: #ebebeb;
    text-align: center;
    padding: 20px;
}

p {
    line-height: 1.6;
    margin-bottom: 15px;
}

.section {
    margin-bottom: 40px;
}

h1, h2, h3 {
    font-weight: normal;
}